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HID: battery: don't do DMA from stack

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Instead of using data from stack for DMA in hidinput_get_battery_property(),
allocate the buffer dynamically.

Cc: stable@kernel.org
Reported-by: Richard Ryniker <ryniker@alum.mit.edu>
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Kosina 2013-09-02 13:43:00 +02:00
parent a4be0ed39f
commit 6c2794a298
1 changed files with 10 additions and 2 deletions
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12
drivers/hid/hid-input.c
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@ -340,7 +340,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
{
struct hid_device *dev = container_of(psy, struct hid_device, battery);
int ret = 0;
__u8 buf[2] = {};
__u8 *buf;
switch (prop) {
case POWER_SUPPLY_PROP_PRESENT:
@ -349,12 +349,19 @@ static int hidinput_get_battery_property(struct power_supply *psy,
break;
case POWER_SUPPLY_PROP_CAPACITY:
buf = kmalloc(2 * sizeof(__u8), GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
break;
}
ret = dev->hid_get_raw_report(dev, dev->battery_report_id,
buf, sizeof(buf),
buf, 2,
dev->battery_report_type);
if (ret != 2) {
ret = -ENODATA;
kfree(buf);
break;
}
ret = 0;
@ -364,6 +371,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
buf[1] <= dev->battery_max)
val->intval = (100 * (buf[1] - dev->battery_min)) /
(dev->battery_max - dev->battery_min);
kfree(buf);
break;
case POWER_SUPPLY_PROP_MODEL_NAME: